Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Erosion
Patent
1997-02-24
1998-07-21
Brock, Michael
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Erosion
73 86, 7386433, 436 6, G01N 104, G01R 2710
Patent
active
057839387
ABSTRACT:
An apparatus and test method for determining the cleanliness (based on corrosivity) of a specific area on an electronic circuit assembly, such as the area between holes or pads on a single side of an assembly. The apparatus includes: (1) an extraction cell for providing an extraction fluid to an electronic circuit assembly ("ECA") area to be measured; (2) an extraction fluid for extracting residue from the ECA area to be measured; (3) a test cell with two or more electrodes and a voltage source for providing a voltage to the electrodes; and (4) a timer for measuring the time between the application of the voltage and an electrical short between the electrodes. The method includes: (1) positioning an extraction cell over an electronic circuit assembly area to be measured; (2) dispensing an extraction fluid into the extraction cell; (3) contacting the ECA area to be measured with the extraction fluid for a time sufficient to extract residue from the ECA area; (4) transferring the extraction fluid to a test cell made of two or more electrodes; (5) applying a voltage to the electrodes; and (6) measuring the time between the application of the voltage and an electrical short between the electrodes.
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Munson Terry L.
Pauls Douglas O.
Brock Michael
Contamination Studies Laboratories, Inc.
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